Android DatePicker在kitkat上设置minDate或maxDate时崩溃

Question

您好，我有一个日期选择器对话框，当用户点击EditText时会弹出。 它可以在我尝试运行Android 6.0的另一台设备上运行，但是当我在运行kitkat的桌子上尝试相同的应用程序时，它崩溃了。

我可以确认它是setMinDate或setMaxDate代码，因为我将其取出并且页面在我这样做后没有崩溃。

这是日志：

E/Android运行时：致命异常：main

流程： com.xxxxxx.销售点， PID： 13402 java.lang.NullPointerException at android.widget.CalendarView.onScroll(CalendarView.java：1216) at android.widget.CalendarView.access$900(CalendarView.java：76) at android.widget.CalendarView$2.onScroll(CalendarView.java：1077) 在 android.widget.AbsListView.invokeOnItemScrollListener(AbsListView.java：1463) at android.widget.ListView.layoutChildren(ListView.java：1745) at android.widget.AbsListView.onLayout(AbsListView.java：2149) at android.view.View.layout(View.java：15125) at android.view.ViewGroup.layout(ViewGroup.java：4862) at android.widget.LinearLayout.setChildFrame(LinearLayout.java：1888) at android.widget.LinearLayout.layoutVertical(LinearLayout.java：1742) at android.widget.LinearLayout.onLayout(LinearLayout.java：1651) at android.view.View.layout(View.java：15125) at android.view.ViewGroup.layout(ViewGroup.java：4862) at android.widget.FrameLayout.layoutChildren(FrameLayout.java：515) at android.widget.FrameLayout.onLayout(FrameLayout.java：450) at android.view.View.layout(View.java：15125) at android.view.ViewGroup.layout(ViewGroup.java：4862) at android.widget.LinearLayout.setChildFrame(LinearLayout.java：1888) 在 android.widget.LinearLayout.layoutHorizontal(LinearLayout.java：1877) at android.widget.LinearLayout.onLayout(LinearLayout.java：1653) at android.view.View.layout(View.java：15125) at android.view.ViewGroup.layout(ViewGroup.java：4862) at android.widget.FrameLayout.layoutChildren(FrameLayout.java：515) at android.widget.FrameLayout.onLayout(FrameLayout.java：450) at android.view.View.layout(View.java：15125) at android.view.ViewGroup.layout(ViewGroup.java：4862) at android.widget.FrameLayout.layoutChildren(FrameLayout.java：515) at android.widget.FrameLayout.onLayout(FrameLayout.java：450) at android.view.View.layout(View.java：15125) at android.view.ViewGroup.layout(ViewGroup.java：4862) at android.widget.FrameLayout.layoutChildren(FrameLayout.java：515) at android.widget.FrameLayout.onLayout(FrameLayout.java：450) at android.view.View.layout(View.java：15125) at android.view.ViewGroup.layout(ViewGroup.java：4862) at android.widget.LinearLayout.setChildFrame(LinearLayout.java：1888) at android.widget.LinearLayout.layoutVertical(LinearLayout.java：1742) at android.widget.LinearLayout.onLayout(LinearLayout.java：1651) at android.view.View.layout(View.java：15125) at android.view.ViewGroup.layout(ViewGroup.java：4862) at android.widget.FrameLayout.layoutChildren(FrameLayout.java：515) at android.widget.FrameLayout.onLayout(FrameLayout.java：450) at android.view.View.layout(View.java：15125) at android.view.ViewGroup.layout(ViewGroup.java：4862) at android.widget.LinearLayout.setChildFrame(LinearLayout.java：1888) at android.widget.LinearLayout.layoutVertical(LinearLayout.java：1742) at android.widget.LinearLayout.onLayout(LinearLayout.java：1651) at android.view.View.layout(View.java：15125) at android.view.ViewGroup.layout(ViewGroup.java：4862) at android.widget.FrameLayout.layoutChildren(FrameLayout.java：515) at android.widget.FrameLayout.onLayout(FrameLayout.java：450) at android.view.View.layout(View.java：15125) at android.view.ViewGroup.layout(ViewGroup.java：4862) at android.view.ViewRootImpl.performLayout(ViewRootImpl.java：2323) at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java：2029) at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java：1192) 在 android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java：6231) 在 android.view.Choreographer$CallbackRecord.run(Choreographer.java：788) at android.view.Choreographer.doCallbacks(Choreographer.java：591) at android.view.Choreographer.doFrame(Choreographer.java：560) 在 android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java：774) at android.os.Handler.handleCallback(Handler.java：808) at android.os.Handler.dispatchMessage(Handler.java：103) at android.os.Looper.loop(Looper.java：193) at android.app.ActivityThread.main(ActivityThread.java：5292) at java.lang.reflect.Method.invokeNative(Nativ

这是我的代码：

final DatePickerDialog.OnDateSetListener mDateSetListener = new DatePickerDialog.OnDateSetListener() {
@Override
public void onDateSet(DatePicker view, int year, int monthOfYear,
int dayOfMonth) {
mCalendar.set(Calendar.YEAR, year);
mCalendar.set(Calendar.MONTH, monthOfYear);
mCalendar.set(Calendar.DAY_OF_MONTH, dayOfMonth);
String myFormat = "yyyy-MM-dd"; //In which you need put here
SimpleDateFormat sdf = new SimpleDateFormat(myFormat, Locale.US);
mSelectedDate = sdf.format(mCalendar.getTime());
etDate.setText(Utils.formatDate(mSelectedDate, "yyyy-MM-dd", "EEEE, d MMMM yyyy"));
getTravelSchedules();
}
};
private final View.OnClickListener mDateViewOnClickListener = new View.OnClickListener() {
@Override
public void onClick(View v) {
if (etDate.getText().toString().equals("")) {
Toast.makeText(getApplicationContext(), "Please select a destination first!", Toast.LENGTH_LONG).show();
return;
}
Date today = new Date();
Calendar c = Calendar.getInstance();
c.setTime(today);
c.add(Calendar.DATE, +7);
final long maxDate = c.getTime().getTime();
c.setTime(today);
final long minDate = c.getTime().getTime();
DatePickerDialog datePickerDialog = new DatePickerDialog(mContext, R.style.DialogTheme, mDateSetListener, mCalendar
.get(Calendar.YEAR), mCalendar.get(Calendar.MONTH),
mCalendar.get(Calendar.DAY_OF_MONTH));
datePickerDialog.getDatePicker().setMinDate(minDate);
datePickerDialog.getDatePicker().setMaxDate(maxDate);
datePickerDialog.show();
}
};

Answer 1

你也可以像这样使用这个函数

void showDatePickerDialog(final EditText et) {
DatePickerDialog.OnDateSetListener date = new DatePickerDialog.OnDateSetListener() {
@Override
public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
// TODO Auto-generated method stub
Calendar myCalendar = Calendar.getInstance();
myCalendar.set(Calendar.YEAR, year);
myCalendar.set(Calendar.MONTH, monthOfYear);
myCalendar.set(Calendar.DAY_OF_MONTH, dayOfMonth);
et.setText(new SimpleDateFormat("dd MMM, yyyy", Locale.getDefault()).format(myCalendar.getTime()));     
}
};
// Calendar Minimum Range
Calendar calendarMinDate = Calendar.getInstance();
calendarMinDate.add(Calendar.DATE, 0);
// Calendar Maximum Range
Calendar calendarMaxDate = Calendar.getInstance();
calendarMaxDate.add(Calendar.DATE, +7);
DatePickerDialog datePickerDialog = new DatePickerDialog(getActivity(),
R.style.MyDatePickerDialogTheme, date, calYear, calMonth, calDay);
datePickerDialog.getDatePicker().setMinDate(calendarMinDate.getTimeInMillis());
datePickerDialog.getDatePicker().setMaxDate(calendarMaxDate.getTimeInMillis());
datePickerDialog.show();
}